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9cfc7bd6 | 1 | /* Copyright (C) 2011-2012 B.A.T.M.A.N. contributors: |
23721387 SW |
2 | * |
3 | * Simon Wunderlich | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
17 | * 02110-1301, USA | |
23721387 SW |
18 | */ |
19 | ||
20 | #include "main.h" | |
21 | #include "hash.h" | |
22 | #include "hard-interface.h" | |
23 | #include "originator.h" | |
24 | #include "bridge_loop_avoidance.h" | |
20ff9d59 | 25 | #include "translation-table.h" |
23721387 SW |
26 | #include "send.h" |
27 | ||
28 | #include <linux/etherdevice.h> | |
29 | #include <linux/crc16.h> | |
30 | #include <linux/if_arp.h> | |
31 | #include <net/arp.h> | |
32 | #include <linux/if_vlan.h> | |
33 | ||
23721387 SW |
34 | static const uint8_t announce_mac[4] = {0x43, 0x05, 0x43, 0x05}; |
35 | ||
36 | static void bla_periodic_work(struct work_struct *work); | |
37 | static void bla_send_announce(struct bat_priv *bat_priv, | |
38 | struct backbone_gw *backbone_gw); | |
39 | ||
40 | /* return the index of the claim */ | |
41 | static inline uint32_t choose_claim(const void *data, uint32_t size) | |
42 | { | |
43 | const unsigned char *key = data; | |
44 | uint32_t hash = 0; | |
45 | size_t i; | |
46 | ||
47 | for (i = 0; i < ETH_ALEN + sizeof(short); i++) { | |
48 | hash += key[i]; | |
49 | hash += (hash << 10); | |
50 | hash ^= (hash >> 6); | |
51 | } | |
52 | ||
53 | hash += (hash << 3); | |
54 | hash ^= (hash >> 11); | |
55 | hash += (hash << 15); | |
56 | ||
57 | return hash % size; | |
58 | } | |
59 | ||
60 | /* return the index of the backbone gateway */ | |
61 | static inline uint32_t choose_backbone_gw(const void *data, uint32_t size) | |
62 | { | |
63 | const unsigned char *key = data; | |
64 | uint32_t hash = 0; | |
65 | size_t i; | |
66 | ||
67 | for (i = 0; i < ETH_ALEN + sizeof(short); i++) { | |
68 | hash += key[i]; | |
69 | hash += (hash << 10); | |
70 | hash ^= (hash >> 6); | |
71 | } | |
72 | ||
73 | hash += (hash << 3); | |
74 | hash ^= (hash >> 11); | |
75 | hash += (hash << 15); | |
76 | ||
77 | return hash % size; | |
78 | } | |
79 | ||
80 | ||
81 | /* compares address and vid of two backbone gws */ | |
82 | static int compare_backbone_gw(const struct hlist_node *node, const void *data2) | |
83 | { | |
84 | const void *data1 = container_of(node, struct backbone_gw, | |
85 | hash_entry); | |
86 | ||
87 | return (memcmp(data1, data2, ETH_ALEN + sizeof(short)) == 0 ? 1 : 0); | |
88 | } | |
89 | ||
90 | /* compares address and vid of two claims */ | |
91 | static int compare_claim(const struct hlist_node *node, const void *data2) | |
92 | { | |
93 | const void *data1 = container_of(node, struct claim, | |
94 | hash_entry); | |
95 | ||
96 | return (memcmp(data1, data2, ETH_ALEN + sizeof(short)) == 0 ? 1 : 0); | |
97 | } | |
98 | ||
99 | /* free a backbone gw */ | |
100 | static void backbone_gw_free_ref(struct backbone_gw *backbone_gw) | |
101 | { | |
102 | if (atomic_dec_and_test(&backbone_gw->refcount)) | |
103 | kfree_rcu(backbone_gw, rcu); | |
104 | } | |
105 | ||
106 | /* finally deinitialize the claim */ | |
107 | static void claim_free_rcu(struct rcu_head *rcu) | |
108 | { | |
109 | struct claim *claim; | |
110 | ||
111 | claim = container_of(rcu, struct claim, rcu); | |
112 | ||
113 | backbone_gw_free_ref(claim->backbone_gw); | |
114 | kfree(claim); | |
115 | } | |
116 | ||
117 | /* free a claim, call claim_free_rcu if its the last reference */ | |
118 | static void claim_free_ref(struct claim *claim) | |
119 | { | |
120 | if (atomic_dec_and_test(&claim->refcount)) | |
121 | call_rcu(&claim->rcu, claim_free_rcu); | |
122 | } | |
123 | ||
9cfc7bd6 | 124 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
125 | * @data: search data (may be local/static data) |
126 | * | |
127 | * looks for a claim in the hash, and returns it if found | |
128 | * or NULL otherwise. | |
129 | */ | |
130 | static struct claim *claim_hash_find(struct bat_priv *bat_priv, | |
131 | struct claim *data) | |
132 | { | |
133 | struct hashtable_t *hash = bat_priv->claim_hash; | |
134 | struct hlist_head *head; | |
135 | struct hlist_node *node; | |
136 | struct claim *claim; | |
137 | struct claim *claim_tmp = NULL; | |
138 | int index; | |
139 | ||
140 | if (!hash) | |
141 | return NULL; | |
142 | ||
143 | index = choose_claim(data, hash->size); | |
144 | head = &hash->table[index]; | |
145 | ||
146 | rcu_read_lock(); | |
147 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
148 | if (!compare_claim(&claim->hash_entry, data)) | |
149 | continue; | |
150 | ||
151 | if (!atomic_inc_not_zero(&claim->refcount)) | |
152 | continue; | |
153 | ||
154 | claim_tmp = claim; | |
155 | break; | |
156 | } | |
157 | rcu_read_unlock(); | |
158 | ||
159 | return claim_tmp; | |
160 | } | |
161 | ||
9cfc7bd6 | 162 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
163 | * @addr: the address of the originator |
164 | * @vid: the VLAN ID | |
165 | * | |
166 | * looks for a claim in the hash, and returns it if found | |
167 | * or NULL otherwise. | |
168 | */ | |
169 | static struct backbone_gw *backbone_hash_find(struct bat_priv *bat_priv, | |
170 | uint8_t *addr, short vid) | |
171 | { | |
172 | struct hashtable_t *hash = bat_priv->backbone_hash; | |
173 | struct hlist_head *head; | |
174 | struct hlist_node *node; | |
175 | struct backbone_gw search_entry, *backbone_gw; | |
176 | struct backbone_gw *backbone_gw_tmp = NULL; | |
177 | int index; | |
178 | ||
179 | if (!hash) | |
180 | return NULL; | |
181 | ||
182 | memcpy(search_entry.orig, addr, ETH_ALEN); | |
183 | search_entry.vid = vid; | |
184 | ||
185 | index = choose_backbone_gw(&search_entry, hash->size); | |
186 | head = &hash->table[index]; | |
187 | ||
188 | rcu_read_lock(); | |
189 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
190 | if (!compare_backbone_gw(&backbone_gw->hash_entry, | |
191 | &search_entry)) | |
192 | continue; | |
193 | ||
194 | if (!atomic_inc_not_zero(&backbone_gw->refcount)) | |
195 | continue; | |
196 | ||
197 | backbone_gw_tmp = backbone_gw; | |
198 | break; | |
199 | } | |
200 | rcu_read_unlock(); | |
201 | ||
202 | return backbone_gw_tmp; | |
203 | } | |
204 | ||
205 | /* delete all claims for a backbone */ | |
206 | static void bla_del_backbone_claims(struct backbone_gw *backbone_gw) | |
207 | { | |
208 | struct hashtable_t *hash; | |
209 | struct hlist_node *node, *node_tmp; | |
210 | struct hlist_head *head; | |
211 | struct claim *claim; | |
212 | int i; | |
213 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
214 | ||
215 | hash = backbone_gw->bat_priv->claim_hash; | |
216 | if (!hash) | |
217 | return; | |
218 | ||
219 | for (i = 0; i < hash->size; i++) { | |
220 | head = &hash->table[i]; | |
221 | list_lock = &hash->list_locks[i]; | |
222 | ||
223 | spin_lock_bh(list_lock); | |
224 | hlist_for_each_entry_safe(claim, node, node_tmp, | |
225 | head, hash_entry) { | |
226 | ||
227 | if (claim->backbone_gw != backbone_gw) | |
228 | continue; | |
229 | ||
230 | claim_free_ref(claim); | |
231 | hlist_del_rcu(node); | |
232 | } | |
233 | spin_unlock_bh(list_lock); | |
234 | } | |
235 | ||
236 | /* all claims gone, intialize CRC */ | |
237 | backbone_gw->crc = BLA_CRC_INIT; | |
238 | } | |
239 | ||
9cfc7bd6 | 240 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
241 | * @orig: the mac address to be announced within the claim |
242 | * @vid: the VLAN ID | |
243 | * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...) | |
244 | * | |
245 | * sends a claim frame according to the provided info. | |
246 | */ | |
247 | static void bla_send_claim(struct bat_priv *bat_priv, uint8_t *mac, | |
248 | short vid, int claimtype) | |
249 | { | |
250 | struct sk_buff *skb; | |
251 | struct ethhdr *ethhdr; | |
252 | struct hard_iface *primary_if; | |
253 | struct net_device *soft_iface; | |
254 | uint8_t *hw_src; | |
255 | struct bla_claim_dst local_claim_dest; | |
3e2f1a1b | 256 | __be32 zeroip = 0; |
23721387 SW |
257 | |
258 | primary_if = primary_if_get_selected(bat_priv); | |
259 | if (!primary_if) | |
260 | return; | |
261 | ||
38ef3d1d SW |
262 | memcpy(&local_claim_dest, &bat_priv->claim_dest, |
263 | sizeof(local_claim_dest)); | |
23721387 SW |
264 | local_claim_dest.type = claimtype; |
265 | ||
266 | soft_iface = primary_if->soft_iface; | |
267 | ||
268 | skb = arp_create(ARPOP_REPLY, ETH_P_ARP, | |
269 | /* IP DST: 0.0.0.0 */ | |
270 | zeroip, | |
271 | primary_if->soft_iface, | |
272 | /* IP SRC: 0.0.0.0 */ | |
273 | zeroip, | |
274 | /* Ethernet DST: Broadcast */ | |
275 | NULL, | |
276 | /* Ethernet SRC/HW SRC: originator mac */ | |
277 | primary_if->net_dev->dev_addr, | |
278 | /* HW DST: FF:43:05:XX:00:00 | |
279 | * with XX = claim type | |
38ef3d1d | 280 | * and YY:YY = group id |
23721387 SW |
281 | */ |
282 | (uint8_t *)&local_claim_dest); | |
283 | ||
284 | if (!skb) | |
285 | goto out; | |
286 | ||
287 | ethhdr = (struct ethhdr *)skb->data; | |
0d125074 | 288 | hw_src = (uint8_t *)ethhdr + ETH_HLEN + sizeof(struct arphdr); |
23721387 SW |
289 | |
290 | /* now we pretend that the client would have sent this ... */ | |
291 | switch (claimtype) { | |
292 | case CLAIM_TYPE_ADD: | |
293 | /* normal claim frame | |
294 | * set Ethernet SRC to the clients mac | |
295 | */ | |
296 | memcpy(ethhdr->h_source, mac, ETH_ALEN); | |
297 | bat_dbg(DBG_BLA, bat_priv, | |
298 | "bla_send_claim(): CLAIM %pM on vid %d\n", mac, vid); | |
299 | break; | |
300 | case CLAIM_TYPE_DEL: | |
301 | /* unclaim frame | |
302 | * set HW SRC to the clients mac | |
303 | */ | |
304 | memcpy(hw_src, mac, ETH_ALEN); | |
305 | bat_dbg(DBG_BLA, bat_priv, | |
306 | "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac, vid); | |
307 | break; | |
308 | case CLAIM_TYPE_ANNOUNCE: | |
309 | /* announcement frame | |
310 | * set HW SRC to the special mac containg the crc | |
311 | */ | |
312 | memcpy(hw_src, mac, ETH_ALEN); | |
313 | bat_dbg(DBG_BLA, bat_priv, | |
314 | "bla_send_claim(): ANNOUNCE of %pM on vid %d\n", | |
315 | ethhdr->h_source, vid); | |
316 | break; | |
317 | case CLAIM_TYPE_REQUEST: | |
318 | /* request frame | |
319 | * set HW SRC to the special mac containg the crc | |
320 | */ | |
321 | memcpy(hw_src, mac, ETH_ALEN); | |
322 | memcpy(ethhdr->h_dest, mac, ETH_ALEN); | |
323 | bat_dbg(DBG_BLA, bat_priv, | |
324 | "bla_send_claim(): REQUEST of %pM to %pMon vid %d\n", | |
325 | ethhdr->h_source, ethhdr->h_dest, vid); | |
326 | break; | |
327 | ||
328 | } | |
329 | ||
330 | if (vid != -1) | |
331 | skb = vlan_insert_tag(skb, vid); | |
332 | ||
333 | skb_reset_mac_header(skb); | |
334 | skb->protocol = eth_type_trans(skb, soft_iface); | |
335 | bat_priv->stats.rx_packets++; | |
0d125074 | 336 | bat_priv->stats.rx_bytes += skb->len + ETH_HLEN; |
23721387 SW |
337 | soft_iface->last_rx = jiffies; |
338 | ||
339 | netif_rx(skb); | |
340 | out: | |
341 | if (primary_if) | |
342 | hardif_free_ref(primary_if); | |
343 | } | |
344 | ||
9cfc7bd6 | 345 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
346 | * @orig: the mac address of the originator |
347 | * @vid: the VLAN ID | |
348 | * | |
349 | * searches for the backbone gw or creates a new one if it could not | |
350 | * be found. | |
351 | */ | |
352 | static struct backbone_gw *bla_get_backbone_gw(struct bat_priv *bat_priv, | |
353 | uint8_t *orig, short vid) | |
354 | { | |
355 | struct backbone_gw *entry; | |
20ff9d59 | 356 | struct orig_node *orig_node; |
23721387 SW |
357 | int hash_added; |
358 | ||
359 | entry = backbone_hash_find(bat_priv, orig, vid); | |
360 | ||
361 | if (entry) | |
362 | return entry; | |
363 | ||
364 | bat_dbg(DBG_BLA, bat_priv, | |
365 | "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n", | |
366 | orig, vid); | |
367 | ||
368 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
369 | if (!entry) | |
370 | return NULL; | |
371 | ||
372 | entry->vid = vid; | |
373 | entry->lasttime = jiffies; | |
374 | entry->crc = BLA_CRC_INIT; | |
375 | entry->bat_priv = bat_priv; | |
376 | atomic_set(&entry->request_sent, 0); | |
377 | memcpy(entry->orig, orig, ETH_ALEN); | |
378 | ||
379 | /* one for the hash, one for returning */ | |
380 | atomic_set(&entry->refcount, 2); | |
381 | ||
382 | hash_added = hash_add(bat_priv->backbone_hash, compare_backbone_gw, | |
383 | choose_backbone_gw, entry, &entry->hash_entry); | |
384 | ||
385 | if (unlikely(hash_added != 0)) { | |
386 | /* hash failed, free the structure */ | |
387 | kfree(entry); | |
388 | return NULL; | |
389 | } | |
390 | ||
20ff9d59 SW |
391 | /* this is a gateway now, remove any tt entries */ |
392 | orig_node = orig_hash_find(bat_priv, orig); | |
393 | if (orig_node) { | |
08c36d3e SE |
394 | batadv_tt_global_del_orig(bat_priv, orig_node, |
395 | "became a backbone gateway"); | |
7d211efc | 396 | batadv_orig_node_free_ref(orig_node); |
20ff9d59 | 397 | } |
23721387 SW |
398 | return entry; |
399 | } | |
400 | ||
401 | /* update or add the own backbone gw to make sure we announce | |
402 | * where we receive other backbone gws | |
403 | */ | |
404 | static void bla_update_own_backbone_gw(struct bat_priv *bat_priv, | |
405 | struct hard_iface *primary_if, | |
406 | short vid) | |
407 | { | |
408 | struct backbone_gw *backbone_gw; | |
409 | ||
410 | backbone_gw = bla_get_backbone_gw(bat_priv, | |
411 | primary_if->net_dev->dev_addr, vid); | |
412 | if (unlikely(!backbone_gw)) | |
413 | return; | |
414 | ||
415 | backbone_gw->lasttime = jiffies; | |
416 | backbone_gw_free_ref(backbone_gw); | |
417 | } | |
418 | ||
9cfc7bd6 | 419 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
420 | * @vid: the vid where the request came on |
421 | * | |
422 | * Repeat all of our own claims, and finally send an ANNOUNCE frame | |
423 | * to allow the requester another check if the CRC is correct now. | |
424 | */ | |
425 | static void bla_answer_request(struct bat_priv *bat_priv, | |
426 | struct hard_iface *primary_if, short vid) | |
427 | { | |
428 | struct hlist_node *node; | |
429 | struct hlist_head *head; | |
430 | struct hashtable_t *hash; | |
431 | struct claim *claim; | |
432 | struct backbone_gw *backbone_gw; | |
433 | int i; | |
434 | ||
435 | bat_dbg(DBG_BLA, bat_priv, | |
436 | "bla_answer_request(): received a claim request, send all of our own claims again\n"); | |
437 | ||
438 | backbone_gw = backbone_hash_find(bat_priv, | |
439 | primary_if->net_dev->dev_addr, vid); | |
440 | if (!backbone_gw) | |
441 | return; | |
442 | ||
443 | hash = bat_priv->claim_hash; | |
444 | for (i = 0; i < hash->size; i++) { | |
445 | head = &hash->table[i]; | |
446 | ||
447 | rcu_read_lock(); | |
448 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
449 | /* only own claims are interesting */ | |
450 | if (claim->backbone_gw != backbone_gw) | |
451 | continue; | |
452 | ||
453 | bla_send_claim(bat_priv, claim->addr, claim->vid, | |
454 | CLAIM_TYPE_ADD); | |
455 | } | |
456 | rcu_read_unlock(); | |
457 | } | |
458 | ||
459 | /* finally, send an announcement frame */ | |
460 | bla_send_announce(bat_priv, backbone_gw); | |
461 | backbone_gw_free_ref(backbone_gw); | |
462 | } | |
463 | ||
9cfc7bd6 | 464 | /* @backbone_gw: the backbone gateway from whom we are out of sync |
23721387 SW |
465 | * |
466 | * When the crc is wrong, ask the backbone gateway for a full table update. | |
467 | * After the request, it will repeat all of his own claims and finally | |
468 | * send an announcement claim with which we can check again. | |
469 | */ | |
470 | static void bla_send_request(struct backbone_gw *backbone_gw) | |
471 | { | |
472 | /* first, remove all old entries */ | |
473 | bla_del_backbone_claims(backbone_gw); | |
474 | ||
475 | bat_dbg(DBG_BLA, backbone_gw->bat_priv, | |
476 | "Sending REQUEST to %pM\n", | |
477 | backbone_gw->orig); | |
478 | ||
479 | /* send request */ | |
480 | bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig, | |
481 | backbone_gw->vid, CLAIM_TYPE_REQUEST); | |
482 | ||
483 | /* no local broadcasts should be sent or received, for now. */ | |
484 | if (!atomic_read(&backbone_gw->request_sent)) { | |
485 | atomic_inc(&backbone_gw->bat_priv->bla_num_requests); | |
486 | atomic_set(&backbone_gw->request_sent, 1); | |
487 | } | |
488 | } | |
489 | ||
9cfc7bd6 | 490 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
491 | * @backbone_gw: our backbone gateway which should be announced |
492 | * | |
493 | * This function sends an announcement. It is called from multiple | |
494 | * places. | |
495 | */ | |
496 | static void bla_send_announce(struct bat_priv *bat_priv, | |
497 | struct backbone_gw *backbone_gw) | |
498 | { | |
499 | uint8_t mac[ETH_ALEN]; | |
3e2f1a1b | 500 | __be16 crc; |
23721387 SW |
501 | |
502 | memcpy(mac, announce_mac, 4); | |
503 | crc = htons(backbone_gw->crc); | |
1a5852d8 | 504 | memcpy(&mac[4], &crc, 2); |
23721387 SW |
505 | |
506 | bla_send_claim(bat_priv, mac, backbone_gw->vid, CLAIM_TYPE_ANNOUNCE); | |
507 | ||
508 | } | |
509 | ||
9cfc7bd6 | 510 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
511 | * @mac: the mac address of the claim |
512 | * @vid: the VLAN ID of the frame | |
513 | * @backbone_gw: the backbone gateway which claims it | |
514 | * | |
515 | * Adds a claim in the claim hash. | |
516 | */ | |
517 | static void bla_add_claim(struct bat_priv *bat_priv, const uint8_t *mac, | |
518 | const short vid, struct backbone_gw *backbone_gw) | |
519 | { | |
520 | struct claim *claim; | |
521 | struct claim search_claim; | |
522 | int hash_added; | |
523 | ||
524 | memcpy(search_claim.addr, mac, ETH_ALEN); | |
525 | search_claim.vid = vid; | |
526 | claim = claim_hash_find(bat_priv, &search_claim); | |
527 | ||
528 | /* create a new claim entry if it does not exist yet. */ | |
529 | if (!claim) { | |
530 | claim = kzalloc(sizeof(*claim), GFP_ATOMIC); | |
531 | if (!claim) | |
532 | return; | |
533 | ||
534 | memcpy(claim->addr, mac, ETH_ALEN); | |
535 | claim->vid = vid; | |
536 | claim->lasttime = jiffies; | |
537 | claim->backbone_gw = backbone_gw; | |
538 | ||
539 | atomic_set(&claim->refcount, 2); | |
540 | bat_dbg(DBG_BLA, bat_priv, | |
541 | "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", | |
542 | mac, vid); | |
543 | hash_added = hash_add(bat_priv->claim_hash, compare_claim, | |
544 | choose_claim, claim, &claim->hash_entry); | |
545 | ||
546 | if (unlikely(hash_added != 0)) { | |
547 | /* only local changes happened. */ | |
548 | kfree(claim); | |
549 | return; | |
550 | } | |
551 | } else { | |
552 | claim->lasttime = jiffies; | |
553 | if (claim->backbone_gw == backbone_gw) | |
554 | /* no need to register a new backbone */ | |
555 | goto claim_free_ref; | |
556 | ||
557 | bat_dbg(DBG_BLA, bat_priv, | |
558 | "bla_add_claim(): changing ownership for %pM, vid %d\n", | |
559 | mac, vid); | |
560 | ||
561 | claim->backbone_gw->crc ^= | |
562 | crc16(0, claim->addr, ETH_ALEN); | |
563 | backbone_gw_free_ref(claim->backbone_gw); | |
564 | ||
565 | } | |
566 | /* set (new) backbone gw */ | |
567 | atomic_inc(&backbone_gw->refcount); | |
568 | claim->backbone_gw = backbone_gw; | |
569 | ||
570 | backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
571 | backbone_gw->lasttime = jiffies; | |
572 | ||
573 | claim_free_ref: | |
574 | claim_free_ref(claim); | |
575 | } | |
576 | ||
577 | /* Delete a claim from the claim hash which has the | |
578 | * given mac address and vid. | |
579 | */ | |
580 | static void bla_del_claim(struct bat_priv *bat_priv, const uint8_t *mac, | |
581 | const short vid) | |
582 | { | |
583 | struct claim search_claim, *claim; | |
584 | ||
585 | memcpy(search_claim.addr, mac, ETH_ALEN); | |
586 | search_claim.vid = vid; | |
587 | claim = claim_hash_find(bat_priv, &search_claim); | |
588 | if (!claim) | |
589 | return; | |
590 | ||
591 | bat_dbg(DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n", mac, vid); | |
592 | ||
593 | hash_remove(bat_priv->claim_hash, compare_claim, choose_claim, claim); | |
594 | claim_free_ref(claim); /* reference from the hash is gone */ | |
595 | ||
596 | claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); | |
597 | ||
598 | /* don't need the reference from hash_find() anymore */ | |
599 | claim_free_ref(claim); | |
600 | } | |
601 | ||
602 | /* check for ANNOUNCE frame, return 1 if handled */ | |
603 | static int handle_announce(struct bat_priv *bat_priv, | |
604 | uint8_t *an_addr, uint8_t *backbone_addr, short vid) | |
605 | { | |
606 | struct backbone_gw *backbone_gw; | |
607 | uint16_t crc; | |
608 | ||
609 | if (memcmp(an_addr, announce_mac, 4) != 0) | |
610 | return 0; | |
611 | ||
612 | backbone_gw = bla_get_backbone_gw(bat_priv, backbone_addr, vid); | |
613 | ||
614 | if (unlikely(!backbone_gw)) | |
615 | return 1; | |
616 | ||
617 | ||
618 | /* handle as ANNOUNCE frame */ | |
619 | backbone_gw->lasttime = jiffies; | |
3e2f1a1b | 620 | crc = ntohs(*((__be16 *)(&an_addr[4]))); |
23721387 SW |
621 | |
622 | bat_dbg(DBG_BLA, bat_priv, | |
623 | "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %04x\n", | |
624 | vid, backbone_gw->orig, crc); | |
625 | ||
626 | if (backbone_gw->crc != crc) { | |
627 | bat_dbg(DBG_BLA, backbone_gw->bat_priv, | |
628 | "handle_announce(): CRC FAILED for %pM/%d (my = %04x, sent = %04x)\n", | |
629 | backbone_gw->orig, backbone_gw->vid, backbone_gw->crc, | |
630 | crc); | |
631 | ||
632 | bla_send_request(backbone_gw); | |
633 | } else { | |
634 | /* if we have sent a request and the crc was OK, | |
635 | * we can allow traffic again. | |
636 | */ | |
637 | if (atomic_read(&backbone_gw->request_sent)) { | |
638 | atomic_dec(&backbone_gw->bat_priv->bla_num_requests); | |
639 | atomic_set(&backbone_gw->request_sent, 0); | |
640 | } | |
641 | } | |
642 | ||
643 | backbone_gw_free_ref(backbone_gw); | |
644 | return 1; | |
645 | } | |
646 | ||
647 | /* check for REQUEST frame, return 1 if handled */ | |
648 | static int handle_request(struct bat_priv *bat_priv, | |
649 | struct hard_iface *primary_if, | |
650 | uint8_t *backbone_addr, | |
651 | struct ethhdr *ethhdr, short vid) | |
652 | { | |
653 | /* check for REQUEST frame */ | |
654 | if (!compare_eth(backbone_addr, ethhdr->h_dest)) | |
655 | return 0; | |
656 | ||
657 | /* sanity check, this should not happen on a normal switch, | |
658 | * we ignore it in this case. | |
659 | */ | |
660 | if (!compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr)) | |
661 | return 1; | |
662 | ||
663 | bat_dbg(DBG_BLA, bat_priv, | |
664 | "handle_request(): REQUEST vid %d (sent by %pM)...\n", | |
665 | vid, ethhdr->h_source); | |
666 | ||
667 | bla_answer_request(bat_priv, primary_if, vid); | |
668 | return 1; | |
669 | } | |
670 | ||
671 | /* check for UNCLAIM frame, return 1 if handled */ | |
672 | static int handle_unclaim(struct bat_priv *bat_priv, | |
673 | struct hard_iface *primary_if, | |
674 | uint8_t *backbone_addr, | |
675 | uint8_t *claim_addr, short vid) | |
676 | { | |
677 | struct backbone_gw *backbone_gw; | |
678 | ||
679 | /* unclaim in any case if it is our own */ | |
680 | if (primary_if && compare_eth(backbone_addr, | |
681 | primary_if->net_dev->dev_addr)) | |
682 | bla_send_claim(bat_priv, claim_addr, vid, CLAIM_TYPE_DEL); | |
683 | ||
684 | backbone_gw = backbone_hash_find(bat_priv, backbone_addr, vid); | |
685 | ||
686 | if (!backbone_gw) | |
687 | return 1; | |
688 | ||
689 | /* this must be an UNCLAIM frame */ | |
690 | bat_dbg(DBG_BLA, bat_priv, | |
691 | "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n", | |
692 | claim_addr, vid, backbone_gw->orig); | |
693 | ||
694 | bla_del_claim(bat_priv, claim_addr, vid); | |
695 | backbone_gw_free_ref(backbone_gw); | |
696 | return 1; | |
697 | } | |
698 | ||
699 | /* check for CLAIM frame, return 1 if handled */ | |
700 | static int handle_claim(struct bat_priv *bat_priv, | |
701 | struct hard_iface *primary_if, uint8_t *backbone_addr, | |
702 | uint8_t *claim_addr, short vid) | |
703 | { | |
704 | struct backbone_gw *backbone_gw; | |
705 | ||
706 | /* register the gateway if not yet available, and add the claim. */ | |
707 | ||
708 | backbone_gw = bla_get_backbone_gw(bat_priv, backbone_addr, vid); | |
709 | ||
710 | if (unlikely(!backbone_gw)) | |
711 | return 1; | |
712 | ||
713 | /* this must be a CLAIM frame */ | |
714 | bla_add_claim(bat_priv, claim_addr, vid, backbone_gw); | |
715 | if (compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) | |
716 | bla_send_claim(bat_priv, claim_addr, vid, CLAIM_TYPE_ADD); | |
717 | ||
718 | /* TODO: we could call something like tt_local_del() here. */ | |
719 | ||
720 | backbone_gw_free_ref(backbone_gw); | |
721 | return 1; | |
722 | } | |
723 | ||
9cfc7bd6 | 724 | /* @bat_priv: the bat priv with all the soft interface information |
38ef3d1d SW |
725 | * @hw_src: the Hardware source in the ARP Header |
726 | * @hw_dst: the Hardware destination in the ARP Header | |
727 | * @ethhdr: pointer to the Ethernet header of the claim frame | |
728 | * | |
729 | * checks if it is a claim packet and if its on the same group. | |
730 | * This function also applies the group ID of the sender | |
731 | * if it is in the same mesh. | |
732 | * | |
733 | * returns: | |
734 | * 2 - if it is a claim packet and on the same group | |
735 | * 1 - if is a claim packet from another group | |
736 | * 0 - if it is not a claim packet | |
737 | */ | |
738 | static int check_claim_group(struct bat_priv *bat_priv, | |
739 | struct hard_iface *primary_if, | |
740 | uint8_t *hw_src, uint8_t *hw_dst, | |
741 | struct ethhdr *ethhdr) | |
742 | { | |
743 | uint8_t *backbone_addr; | |
744 | struct orig_node *orig_node; | |
745 | struct bla_claim_dst *bla_dst, *bla_dst_own; | |
746 | ||
747 | bla_dst = (struct bla_claim_dst *)hw_dst; | |
748 | bla_dst_own = &bat_priv->claim_dest; | |
749 | ||
750 | /* check if it is a claim packet in general */ | |
751 | if (memcmp(bla_dst->magic, bla_dst_own->magic, | |
752 | sizeof(bla_dst->magic)) != 0) | |
753 | return 0; | |
754 | ||
755 | /* if announcement packet, use the source, | |
756 | * otherwise assume it is in the hw_src | |
757 | */ | |
758 | switch (bla_dst->type) { | |
759 | case CLAIM_TYPE_ADD: | |
760 | backbone_addr = hw_src; | |
761 | break; | |
762 | case CLAIM_TYPE_REQUEST: | |
763 | case CLAIM_TYPE_ANNOUNCE: | |
764 | case CLAIM_TYPE_DEL: | |
765 | backbone_addr = ethhdr->h_source; | |
766 | break; | |
767 | default: | |
768 | return 0; | |
769 | } | |
770 | ||
771 | /* don't accept claim frames from ourselves */ | |
772 | if (compare_eth(backbone_addr, primary_if->net_dev->dev_addr)) | |
773 | return 0; | |
774 | ||
775 | /* if its already the same group, it is fine. */ | |
776 | if (bla_dst->group == bla_dst_own->group) | |
777 | return 2; | |
778 | ||
779 | /* lets see if this originator is in our mesh */ | |
780 | orig_node = orig_hash_find(bat_priv, backbone_addr); | |
781 | ||
782 | /* dont accept claims from gateways which are not in | |
783 | * the same mesh or group. | |
784 | */ | |
785 | if (!orig_node) | |
786 | return 1; | |
787 | ||
788 | /* if our mesh friends mac is bigger, use it for ourselves. */ | |
789 | if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) { | |
790 | bat_dbg(DBG_BLA, bat_priv, | |
791 | "taking other backbones claim group: %04x\n", | |
792 | ntohs(bla_dst->group)); | |
793 | bla_dst_own->group = bla_dst->group; | |
794 | } | |
795 | ||
7d211efc | 796 | batadv_orig_node_free_ref(orig_node); |
38ef3d1d SW |
797 | |
798 | return 2; | |
799 | } | |
800 | ||
801 | ||
9cfc7bd6 | 802 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
803 | * @skb: the frame to be checked |
804 | * | |
805 | * Check if this is a claim frame, and process it accordingly. | |
806 | * | |
807 | * returns 1 if it was a claim frame, otherwise return 0 to | |
808 | * tell the callee that it can use the frame on its own. | |
809 | */ | |
810 | static int bla_process_claim(struct bat_priv *bat_priv, | |
811 | struct hard_iface *primary_if, | |
812 | struct sk_buff *skb) | |
813 | { | |
814 | struct ethhdr *ethhdr; | |
815 | struct vlan_ethhdr *vhdr; | |
816 | struct arphdr *arphdr; | |
817 | uint8_t *hw_src, *hw_dst; | |
818 | struct bla_claim_dst *bla_dst; | |
819 | uint16_t proto; | |
820 | int headlen; | |
821 | short vid = -1; | |
38ef3d1d | 822 | int ret; |
23721387 SW |
823 | |
824 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
825 | ||
826 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
827 | vhdr = (struct vlan_ethhdr *)ethhdr; | |
828 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
829 | proto = ntohs(vhdr->h_vlan_encapsulated_proto); | |
830 | headlen = sizeof(*vhdr); | |
831 | } else { | |
832 | proto = ntohs(ethhdr->h_proto); | |
0d125074 | 833 | headlen = ETH_HLEN; |
23721387 SW |
834 | } |
835 | ||
836 | if (proto != ETH_P_ARP) | |
837 | return 0; /* not a claim frame */ | |
838 | ||
839 | /* this must be a ARP frame. check if it is a claim. */ | |
840 | ||
841 | if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev)))) | |
842 | return 0; | |
843 | ||
844 | /* pskb_may_pull() may have modified the pointers, get ethhdr again */ | |
845 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
846 | arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen); | |
847 | ||
848 | /* Check whether the ARP frame carries a valid | |
849 | * IP information | |
850 | */ | |
23721387 SW |
851 | if (arphdr->ar_hrd != htons(ARPHRD_ETHER)) |
852 | return 0; | |
853 | if (arphdr->ar_pro != htons(ETH_P_IP)) | |
854 | return 0; | |
855 | if (arphdr->ar_hln != ETH_ALEN) | |
856 | return 0; | |
857 | if (arphdr->ar_pln != 4) | |
858 | return 0; | |
859 | ||
860 | hw_src = (uint8_t *)arphdr + sizeof(struct arphdr); | |
861 | hw_dst = hw_src + ETH_ALEN + 4; | |
862 | bla_dst = (struct bla_claim_dst *)hw_dst; | |
863 | ||
864 | /* check if it is a claim frame. */ | |
38ef3d1d SW |
865 | ret = check_claim_group(bat_priv, primary_if, hw_src, hw_dst, ethhdr); |
866 | if (ret == 1) | |
867 | bat_dbg(DBG_BLA, bat_priv, | |
868 | "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", | |
869 | ethhdr->h_source, vid, hw_src, hw_dst); | |
870 | ||
871 | if (ret < 2) | |
872 | return ret; | |
23721387 SW |
873 | |
874 | /* become a backbone gw ourselves on this vlan if not happened yet */ | |
875 | bla_update_own_backbone_gw(bat_priv, primary_if, vid); | |
876 | ||
877 | /* check for the different types of claim frames ... */ | |
878 | switch (bla_dst->type) { | |
879 | case CLAIM_TYPE_ADD: | |
880 | if (handle_claim(bat_priv, primary_if, hw_src, | |
881 | ethhdr->h_source, vid)) | |
882 | return 1; | |
883 | break; | |
884 | case CLAIM_TYPE_DEL: | |
885 | if (handle_unclaim(bat_priv, primary_if, | |
886 | ethhdr->h_source, hw_src, vid)) | |
887 | return 1; | |
888 | break; | |
889 | ||
890 | case CLAIM_TYPE_ANNOUNCE: | |
891 | if (handle_announce(bat_priv, hw_src, ethhdr->h_source, vid)) | |
892 | return 1; | |
893 | break; | |
894 | case CLAIM_TYPE_REQUEST: | |
895 | if (handle_request(bat_priv, primary_if, hw_src, ethhdr, vid)) | |
896 | return 1; | |
897 | break; | |
898 | } | |
899 | ||
900 | bat_dbg(DBG_BLA, bat_priv, | |
901 | "bla_process_claim(): ERROR - this looks like a claim frame, but is useless. eth src %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n", | |
902 | ethhdr->h_source, vid, hw_src, hw_dst); | |
903 | return 1; | |
904 | } | |
905 | ||
906 | /* Check when we last heard from other nodes, and remove them in case of | |
907 | * a time out, or clean all backbone gws if now is set. | |
908 | */ | |
909 | static void bla_purge_backbone_gw(struct bat_priv *bat_priv, int now) | |
910 | { | |
911 | struct backbone_gw *backbone_gw; | |
912 | struct hlist_node *node, *node_tmp; | |
913 | struct hlist_head *head; | |
914 | struct hashtable_t *hash; | |
915 | spinlock_t *list_lock; /* protects write access to the hash lists */ | |
916 | int i; | |
917 | ||
918 | hash = bat_priv->backbone_hash; | |
919 | if (!hash) | |
920 | return; | |
921 | ||
922 | for (i = 0; i < hash->size; i++) { | |
923 | head = &hash->table[i]; | |
924 | list_lock = &hash->list_locks[i]; | |
925 | ||
926 | spin_lock_bh(list_lock); | |
927 | hlist_for_each_entry_safe(backbone_gw, node, node_tmp, | |
928 | head, hash_entry) { | |
929 | if (now) | |
930 | goto purge_now; | |
931 | if (!has_timed_out(backbone_gw->lasttime, | |
932 | BLA_BACKBONE_TIMEOUT)) | |
933 | continue; | |
934 | ||
935 | bat_dbg(DBG_BLA, backbone_gw->bat_priv, | |
936 | "bla_purge_backbone_gw(): backbone gw %pM timed out\n", | |
937 | backbone_gw->orig); | |
938 | ||
939 | purge_now: | |
940 | /* don't wait for the pending request anymore */ | |
941 | if (atomic_read(&backbone_gw->request_sent)) | |
942 | atomic_dec(&bat_priv->bla_num_requests); | |
943 | ||
944 | bla_del_backbone_claims(backbone_gw); | |
945 | ||
946 | hlist_del_rcu(node); | |
947 | backbone_gw_free_ref(backbone_gw); | |
948 | } | |
949 | spin_unlock_bh(list_lock); | |
950 | } | |
951 | } | |
952 | ||
9cfc7bd6 | 953 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
954 | * @primary_if: the selected primary interface, may be NULL if now is set |
955 | * @now: whether the whole hash shall be wiped now | |
956 | * | |
957 | * Check when we heard last time from our own claims, and remove them in case of | |
958 | * a time out, or clean all claims if now is set | |
959 | */ | |
960 | static void bla_purge_claims(struct bat_priv *bat_priv, | |
961 | struct hard_iface *primary_if, int now) | |
962 | { | |
963 | struct claim *claim; | |
964 | struct hlist_node *node; | |
965 | struct hlist_head *head; | |
966 | struct hashtable_t *hash; | |
967 | int i; | |
968 | ||
969 | hash = bat_priv->claim_hash; | |
970 | if (!hash) | |
971 | return; | |
972 | ||
973 | for (i = 0; i < hash->size; i++) { | |
974 | head = &hash->table[i]; | |
975 | ||
976 | rcu_read_lock(); | |
977 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
978 | if (now) | |
979 | goto purge_now; | |
980 | if (!compare_eth(claim->backbone_gw->orig, | |
981 | primary_if->net_dev->dev_addr)) | |
982 | continue; | |
983 | if (!has_timed_out(claim->lasttime, | |
984 | BLA_CLAIM_TIMEOUT)) | |
985 | continue; | |
986 | ||
987 | bat_dbg(DBG_BLA, bat_priv, | |
988 | "bla_purge_claims(): %pM, vid %d, time out\n", | |
989 | claim->addr, claim->vid); | |
990 | ||
991 | purge_now: | |
992 | handle_unclaim(bat_priv, primary_if, | |
993 | claim->backbone_gw->orig, | |
994 | claim->addr, claim->vid); | |
995 | } | |
996 | rcu_read_unlock(); | |
997 | } | |
998 | } | |
999 | ||
9cfc7bd6 | 1000 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1001 | * @primary_if: the new selected primary_if |
1002 | * @oldif: the old primary interface, may be NULL | |
1003 | * | |
1004 | * Update the backbone gateways when the own orig address changes. | |
23721387 | 1005 | */ |
08adf151 SE |
1006 | void batadv_bla_update_orig_address(struct bat_priv *bat_priv, |
1007 | struct hard_iface *primary_if, | |
1008 | struct hard_iface *oldif) | |
23721387 SW |
1009 | { |
1010 | struct backbone_gw *backbone_gw; | |
1011 | struct hlist_node *node; | |
1012 | struct hlist_head *head; | |
1013 | struct hashtable_t *hash; | |
1014 | int i; | |
1015 | ||
38ef3d1d SW |
1016 | /* reset bridge loop avoidance group id */ |
1017 | bat_priv->claim_dest.group = | |
1018 | htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN)); | |
1019 | ||
23721387 SW |
1020 | if (!oldif) { |
1021 | bla_purge_claims(bat_priv, NULL, 1); | |
1022 | bla_purge_backbone_gw(bat_priv, 1); | |
1023 | return; | |
1024 | } | |
1025 | ||
1026 | hash = bat_priv->backbone_hash; | |
1027 | if (!hash) | |
1028 | return; | |
1029 | ||
1030 | for (i = 0; i < hash->size; i++) { | |
1031 | head = &hash->table[i]; | |
1032 | ||
1033 | rcu_read_lock(); | |
1034 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1035 | /* own orig still holds the old value. */ | |
1036 | if (!compare_eth(backbone_gw->orig, | |
1037 | oldif->net_dev->dev_addr)) | |
1038 | continue; | |
1039 | ||
1040 | memcpy(backbone_gw->orig, | |
1041 | primary_if->net_dev->dev_addr, ETH_ALEN); | |
1042 | /* send an announce frame so others will ask for our | |
1043 | * claims and update their tables. | |
1044 | */ | |
1045 | bla_send_announce(bat_priv, backbone_gw); | |
1046 | } | |
1047 | rcu_read_unlock(); | |
1048 | } | |
1049 | } | |
1050 | ||
1051 | ||
1052 | ||
1053 | /* (re)start the timer */ | |
1054 | static void bla_start_timer(struct bat_priv *bat_priv) | |
1055 | { | |
1056 | INIT_DELAYED_WORK(&bat_priv->bla_work, bla_periodic_work); | |
3193e8fd | 1057 | queue_delayed_work(batadv_event_workqueue, &bat_priv->bla_work, |
23721387 SW |
1058 | msecs_to_jiffies(BLA_PERIOD_LENGTH)); |
1059 | } | |
1060 | ||
1061 | /* periodic work to do: | |
1062 | * * purge structures when they are too old | |
1063 | * * send announcements | |
1064 | */ | |
1065 | static void bla_periodic_work(struct work_struct *work) | |
1066 | { | |
1067 | struct delayed_work *delayed_work = | |
1068 | container_of(work, struct delayed_work, work); | |
1069 | struct bat_priv *bat_priv = | |
1070 | container_of(delayed_work, struct bat_priv, bla_work); | |
1071 | struct hlist_node *node; | |
1072 | struct hlist_head *head; | |
1073 | struct backbone_gw *backbone_gw; | |
1074 | struct hashtable_t *hash; | |
1075 | struct hard_iface *primary_if; | |
1076 | int i; | |
1077 | ||
1078 | primary_if = primary_if_get_selected(bat_priv); | |
1079 | if (!primary_if) | |
1080 | goto out; | |
1081 | ||
1082 | bla_purge_claims(bat_priv, primary_if, 0); | |
1083 | bla_purge_backbone_gw(bat_priv, 0); | |
1084 | ||
1085 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1086 | goto out; | |
1087 | ||
1088 | hash = bat_priv->backbone_hash; | |
1089 | if (!hash) | |
1090 | goto out; | |
1091 | ||
1092 | for (i = 0; i < hash->size; i++) { | |
1093 | head = &hash->table[i]; | |
1094 | ||
1095 | rcu_read_lock(); | |
1096 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1097 | if (!compare_eth(backbone_gw->orig, | |
1098 | primary_if->net_dev->dev_addr)) | |
1099 | continue; | |
1100 | ||
1101 | backbone_gw->lasttime = jiffies; | |
1102 | ||
1103 | bla_send_announce(bat_priv, backbone_gw); | |
1104 | } | |
1105 | rcu_read_unlock(); | |
1106 | } | |
1107 | out: | |
1108 | if (primary_if) | |
1109 | hardif_free_ref(primary_if); | |
1110 | ||
1111 | bla_start_timer(bat_priv); | |
1112 | } | |
1113 | ||
5d52dad2 SE |
1114 | /* The hash for claim and backbone hash receive the same key because they |
1115 | * are getting initialized by hash_new with the same key. Reinitializing | |
1116 | * them with to different keys to allow nested locking without generating | |
1117 | * lockdep warnings | |
1118 | */ | |
1119 | static struct lock_class_key claim_hash_lock_class_key; | |
1120 | static struct lock_class_key backbone_hash_lock_class_key; | |
1121 | ||
23721387 | 1122 | /* initialize all bla structures */ |
08adf151 | 1123 | int batadv_bla_init(struct bat_priv *bat_priv) |
23721387 | 1124 | { |
fe2da6ff | 1125 | int i; |
38ef3d1d SW |
1126 | uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00}; |
1127 | struct hard_iface *primary_if; | |
fe2da6ff | 1128 | |
23721387 SW |
1129 | bat_dbg(DBG_BLA, bat_priv, "bla hash registering\n"); |
1130 | ||
38ef3d1d SW |
1131 | /* setting claim destination address */ |
1132 | memcpy(&bat_priv->claim_dest.magic, claim_dest, 3); | |
1133 | bat_priv->claim_dest.type = 0; | |
1134 | primary_if = primary_if_get_selected(bat_priv); | |
1135 | if (primary_if) { | |
1136 | bat_priv->claim_dest.group = | |
1137 | htons(crc16(0, primary_if->net_dev->dev_addr, | |
1138 | ETH_ALEN)); | |
1139 | hardif_free_ref(primary_if); | |
1140 | } else { | |
1141 | bat_priv->claim_dest.group = 0; /* will be set later */ | |
1142 | } | |
1143 | ||
fe2da6ff SW |
1144 | /* initialize the duplicate list */ |
1145 | for (i = 0; i < DUPLIST_SIZE; i++) | |
1146 | bat_priv->bcast_duplist[i].entrytime = | |
1147 | jiffies - msecs_to_jiffies(DUPLIST_TIMEOUT); | |
1148 | bat_priv->bcast_duplist_curr = 0; | |
1149 | ||
23721387 | 1150 | if (bat_priv->claim_hash) |
5346c35e | 1151 | return 0; |
23721387 | 1152 | |
1a8eaf07 SE |
1153 | bat_priv->claim_hash = batadv_hash_new(128); |
1154 | bat_priv->backbone_hash = batadv_hash_new(32); | |
23721387 SW |
1155 | |
1156 | if (!bat_priv->claim_hash || !bat_priv->backbone_hash) | |
5346c35e | 1157 | return -ENOMEM; |
23721387 | 1158 | |
5d52dad2 SE |
1159 | batadv_hash_set_lock_class(bat_priv->claim_hash, |
1160 | &claim_hash_lock_class_key); | |
1161 | batadv_hash_set_lock_class(bat_priv->backbone_hash, | |
1162 | &backbone_hash_lock_class_key); | |
1163 | ||
23721387 SW |
1164 | bat_dbg(DBG_BLA, bat_priv, "bla hashes initialized\n"); |
1165 | ||
1166 | bla_start_timer(bat_priv); | |
5346c35e | 1167 | return 0; |
23721387 SW |
1168 | } |
1169 | ||
9cfc7bd6 | 1170 | /* @bat_priv: the bat priv with all the soft interface information |
fe2da6ff SW |
1171 | * @bcast_packet: originator mac address |
1172 | * @hdr_size: maximum length of the frame | |
1173 | * | |
1174 | * check if it is on our broadcast list. Another gateway might | |
1175 | * have sent the same packet because it is connected to the same backbone, | |
1176 | * so we have to remove this duplicate. | |
1177 | * | |
1178 | * This is performed by checking the CRC, which will tell us | |
1179 | * with a good chance that it is the same packet. If it is furthermore | |
1180 | * sent by another host, drop it. We allow equal packets from | |
1181 | * the same host however as this might be intended. | |
9cfc7bd6 | 1182 | */ |
08adf151 SE |
1183 | int batadv_bla_check_bcast_duplist(struct bat_priv *bat_priv, |
1184 | struct bcast_packet *bcast_packet, | |
1185 | int hdr_size) | |
fe2da6ff SW |
1186 | { |
1187 | int i, length, curr; | |
1188 | uint8_t *content; | |
1189 | uint16_t crc; | |
1190 | struct bcast_duplist_entry *entry; | |
1191 | ||
1192 | length = hdr_size - sizeof(*bcast_packet); | |
1193 | content = (uint8_t *)bcast_packet; | |
1194 | content += sizeof(*bcast_packet); | |
1195 | ||
1196 | /* calculate the crc ... */ | |
1197 | crc = crc16(0, content, length); | |
1198 | ||
1199 | for (i = 0 ; i < DUPLIST_SIZE; i++) { | |
1200 | curr = (bat_priv->bcast_duplist_curr + i) % DUPLIST_SIZE; | |
1201 | entry = &bat_priv->bcast_duplist[curr]; | |
1202 | ||
1203 | /* we can stop searching if the entry is too old ; | |
1204 | * later entries will be even older | |
1205 | */ | |
1206 | if (has_timed_out(entry->entrytime, DUPLIST_TIMEOUT)) | |
1207 | break; | |
1208 | ||
1209 | if (entry->crc != crc) | |
1210 | continue; | |
1211 | ||
1212 | if (compare_eth(entry->orig, bcast_packet->orig)) | |
1213 | continue; | |
1214 | ||
1215 | /* this entry seems to match: same crc, not too old, | |
1216 | * and from another gw. therefore return 1 to forbid it. | |
1217 | */ | |
1218 | return 1; | |
1219 | } | |
1220 | /* not found, add a new entry (overwrite the oldest entry) */ | |
1221 | curr = (bat_priv->bcast_duplist_curr + DUPLIST_SIZE - 1) % DUPLIST_SIZE; | |
1222 | entry = &bat_priv->bcast_duplist[curr]; | |
1223 | entry->crc = crc; | |
1224 | entry->entrytime = jiffies; | |
1225 | memcpy(entry->orig, bcast_packet->orig, ETH_ALEN); | |
1226 | bat_priv->bcast_duplist_curr = curr; | |
1227 | ||
1228 | /* allow it, its the first occurence. */ | |
1229 | return 0; | |
1230 | } | |
1231 | ||
1232 | ||
1233 | ||
9cfc7bd6 | 1234 | /* @bat_priv: the bat priv with all the soft interface information |
20ff9d59 SW |
1235 | * @orig: originator mac address |
1236 | * | |
1237 | * check if the originator is a gateway for any VLAN ID. | |
1238 | * | |
1239 | * returns 1 if it is found, 0 otherwise | |
20ff9d59 | 1240 | */ |
08adf151 | 1241 | int batadv_bla_is_backbone_gw_orig(struct bat_priv *bat_priv, uint8_t *orig) |
20ff9d59 SW |
1242 | { |
1243 | struct hashtable_t *hash = bat_priv->backbone_hash; | |
1244 | struct hlist_head *head; | |
1245 | struct hlist_node *node; | |
1246 | struct backbone_gw *backbone_gw; | |
1247 | int i; | |
1248 | ||
1249 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1250 | return 0; | |
1251 | ||
1252 | if (!hash) | |
1253 | return 0; | |
1254 | ||
1255 | for (i = 0; i < hash->size; i++) { | |
1256 | head = &hash->table[i]; | |
1257 | ||
1258 | rcu_read_lock(); | |
1259 | hlist_for_each_entry_rcu(backbone_gw, node, head, hash_entry) { | |
1260 | if (compare_eth(backbone_gw->orig, orig)) { | |
1261 | rcu_read_unlock(); | |
1262 | return 1; | |
1263 | } | |
1264 | } | |
1265 | rcu_read_unlock(); | |
1266 | } | |
1267 | ||
1268 | return 0; | |
1269 | } | |
1270 | ||
1271 | ||
9cfc7bd6 | 1272 | /* @skb: the frame to be checked |
23721387 SW |
1273 | * @orig_node: the orig_node of the frame |
1274 | * @hdr_size: maximum length of the frame | |
1275 | * | |
1276 | * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1 | |
1277 | * if the orig_node is also a gateway on the soft interface, otherwise it | |
1278 | * returns 0. | |
23721387 | 1279 | */ |
08adf151 SE |
1280 | int batadv_bla_is_backbone_gw(struct sk_buff *skb, |
1281 | struct orig_node *orig_node, int hdr_size) | |
23721387 SW |
1282 | { |
1283 | struct ethhdr *ethhdr; | |
1284 | struct vlan_ethhdr *vhdr; | |
1285 | struct backbone_gw *backbone_gw; | |
1286 | short vid = -1; | |
1287 | ||
1288 | if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance)) | |
1289 | return 0; | |
1290 | ||
1291 | /* first, find out the vid. */ | |
0d125074 | 1292 | if (!pskb_may_pull(skb, hdr_size + ETH_HLEN)) |
23721387 SW |
1293 | return 0; |
1294 | ||
1295 | ethhdr = (struct ethhdr *)(((uint8_t *)skb->data) + hdr_size); | |
1296 | ||
1297 | if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { | |
1298 | if (!pskb_may_pull(skb, hdr_size + sizeof(struct vlan_ethhdr))) | |
1299 | return 0; | |
1300 | ||
1301 | vhdr = (struct vlan_ethhdr *)(((uint8_t *)skb->data) + | |
1302 | hdr_size); | |
1303 | vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; | |
1304 | } | |
1305 | ||
1306 | /* see if this originator is a backbone gw for this VLAN */ | |
23721387 SW |
1307 | backbone_gw = backbone_hash_find(orig_node->bat_priv, |
1308 | orig_node->orig, vid); | |
1309 | if (!backbone_gw) | |
1310 | return 0; | |
1311 | ||
1312 | backbone_gw_free_ref(backbone_gw); | |
1313 | return 1; | |
1314 | } | |
1315 | ||
1316 | /* free all bla structures (for softinterface free or module unload) */ | |
08adf151 | 1317 | void batadv_bla_free(struct bat_priv *bat_priv) |
23721387 SW |
1318 | { |
1319 | struct hard_iface *primary_if; | |
1320 | ||
1321 | cancel_delayed_work_sync(&bat_priv->bla_work); | |
1322 | primary_if = primary_if_get_selected(bat_priv); | |
1323 | ||
1324 | if (bat_priv->claim_hash) { | |
1325 | bla_purge_claims(bat_priv, primary_if, 1); | |
1a8eaf07 | 1326 | batadv_hash_destroy(bat_priv->claim_hash); |
23721387 SW |
1327 | bat_priv->claim_hash = NULL; |
1328 | } | |
1329 | if (bat_priv->backbone_hash) { | |
1330 | bla_purge_backbone_gw(bat_priv, 1); | |
1a8eaf07 | 1331 | batadv_hash_destroy(bat_priv->backbone_hash); |
23721387 SW |
1332 | bat_priv->backbone_hash = NULL; |
1333 | } | |
1334 | if (primary_if) | |
1335 | hardif_free_ref(primary_if); | |
1336 | } | |
1337 | ||
9cfc7bd6 | 1338 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1339 | * @skb: the frame to be checked |
1340 | * @vid: the VLAN ID of the frame | |
1341 | * | |
1342 | * bla_rx avoidance checks if: | |
1343 | * * we have to race for a claim | |
1344 | * * if the frame is allowed on the LAN | |
1345 | * | |
1346 | * in these cases, the skb is further handled by this function and | |
1347 | * returns 1, otherwise it returns 0 and the caller shall further | |
1348 | * process the skb. | |
23721387 | 1349 | */ |
08adf151 | 1350 | int batadv_bla_rx(struct bat_priv *bat_priv, struct sk_buff *skb, short vid) |
23721387 SW |
1351 | { |
1352 | struct ethhdr *ethhdr; | |
1353 | struct claim search_claim, *claim = NULL; | |
1354 | struct hard_iface *primary_if; | |
1355 | int ret; | |
1356 | ||
1357 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1358 | ||
1359 | primary_if = primary_if_get_selected(bat_priv); | |
1360 | if (!primary_if) | |
1361 | goto handled; | |
1362 | ||
1363 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1364 | goto allow; | |
1365 | ||
1366 | ||
1367 | if (unlikely(atomic_read(&bat_priv->bla_num_requests))) | |
1368 | /* don't allow broadcasts while requests are in flight */ | |
1369 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1370 | goto handled; | |
1371 | ||
1372 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); | |
1373 | search_claim.vid = vid; | |
1374 | claim = claim_hash_find(bat_priv, &search_claim); | |
1375 | ||
1376 | if (!claim) { | |
1377 | /* possible optimization: race for a claim */ | |
1378 | /* No claim exists yet, claim it for us! | |
1379 | */ | |
1380 | handle_claim(bat_priv, primary_if, | |
1381 | primary_if->net_dev->dev_addr, | |
1382 | ethhdr->h_source, vid); | |
1383 | goto allow; | |
1384 | } | |
1385 | ||
1386 | /* if it is our own claim ... */ | |
1387 | if (compare_eth(claim->backbone_gw->orig, | |
1388 | primary_if->net_dev->dev_addr)) { | |
1389 | /* ... allow it in any case */ | |
1390 | claim->lasttime = jiffies; | |
1391 | goto allow; | |
1392 | } | |
1393 | ||
1394 | /* if it is a broadcast ... */ | |
1395 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1396 | /* ... drop it. the responsible gateway is in charge. */ | |
1397 | goto handled; | |
1398 | } else { | |
1399 | /* seems the client considers us as its best gateway. | |
1400 | * send a claim and update the claim table | |
1401 | * immediately. | |
1402 | */ | |
1403 | handle_claim(bat_priv, primary_if, | |
1404 | primary_if->net_dev->dev_addr, | |
1405 | ethhdr->h_source, vid); | |
1406 | goto allow; | |
1407 | } | |
1408 | allow: | |
1409 | bla_update_own_backbone_gw(bat_priv, primary_if, vid); | |
1410 | ret = 0; | |
1411 | goto out; | |
1412 | ||
1413 | handled: | |
1414 | kfree_skb(skb); | |
1415 | ret = 1; | |
1416 | ||
1417 | out: | |
1418 | if (primary_if) | |
1419 | hardif_free_ref(primary_if); | |
1420 | if (claim) | |
1421 | claim_free_ref(claim); | |
1422 | return ret; | |
1423 | } | |
1424 | ||
9cfc7bd6 | 1425 | /* @bat_priv: the bat priv with all the soft interface information |
23721387 SW |
1426 | * @skb: the frame to be checked |
1427 | * @vid: the VLAN ID of the frame | |
1428 | * | |
1429 | * bla_tx checks if: | |
1430 | * * a claim was received which has to be processed | |
1431 | * * the frame is allowed on the mesh | |
1432 | * | |
1433 | * in these cases, the skb is further handled by this function and | |
1434 | * returns 1, otherwise it returns 0 and the caller shall further | |
1435 | * process the skb. | |
23721387 | 1436 | */ |
08adf151 | 1437 | int batadv_bla_tx(struct bat_priv *bat_priv, struct sk_buff *skb, short vid) |
23721387 SW |
1438 | { |
1439 | struct ethhdr *ethhdr; | |
1440 | struct claim search_claim, *claim = NULL; | |
1441 | struct hard_iface *primary_if; | |
1442 | int ret = 0; | |
1443 | ||
1444 | primary_if = primary_if_get_selected(bat_priv); | |
1445 | if (!primary_if) | |
1446 | goto out; | |
1447 | ||
1448 | if (!atomic_read(&bat_priv->bridge_loop_avoidance)) | |
1449 | goto allow; | |
1450 | ||
1451 | /* in VLAN case, the mac header might not be set. */ | |
1452 | skb_reset_mac_header(skb); | |
1453 | ||
1454 | if (bla_process_claim(bat_priv, primary_if, skb)) | |
1455 | goto handled; | |
1456 | ||
1457 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1458 | ||
1459 | if (unlikely(atomic_read(&bat_priv->bla_num_requests))) | |
1460 | /* don't allow broadcasts while requests are in flight */ | |
1461 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
1462 | goto handled; | |
1463 | ||
1464 | memcpy(search_claim.addr, ethhdr->h_source, ETH_ALEN); | |
1465 | search_claim.vid = vid; | |
1466 | ||
1467 | claim = claim_hash_find(bat_priv, &search_claim); | |
1468 | ||
1469 | /* if no claim exists, allow it. */ | |
1470 | if (!claim) | |
1471 | goto allow; | |
1472 | ||
1473 | /* check if we are responsible. */ | |
1474 | if (compare_eth(claim->backbone_gw->orig, | |
1475 | primary_if->net_dev->dev_addr)) { | |
1476 | /* if yes, the client has roamed and we have | |
1477 | * to unclaim it. | |
1478 | */ | |
1479 | handle_unclaim(bat_priv, primary_if, | |
1480 | primary_if->net_dev->dev_addr, | |
1481 | ethhdr->h_source, vid); | |
1482 | goto allow; | |
1483 | } | |
1484 | ||
1485 | /* check if it is a multicast/broadcast frame */ | |
1486 | if (is_multicast_ether_addr(ethhdr->h_dest)) { | |
1487 | /* drop it. the responsible gateway has forwarded it into | |
1488 | * the backbone network. | |
1489 | */ | |
1490 | goto handled; | |
1491 | } else { | |
1492 | /* we must allow it. at least if we are | |
1493 | * responsible for the DESTINATION. | |
1494 | */ | |
1495 | goto allow; | |
1496 | } | |
1497 | allow: | |
1498 | bla_update_own_backbone_gw(bat_priv, primary_if, vid); | |
1499 | ret = 0; | |
1500 | goto out; | |
1501 | handled: | |
1502 | ret = 1; | |
1503 | out: | |
1504 | if (primary_if) | |
1505 | hardif_free_ref(primary_if); | |
1506 | if (claim) | |
1507 | claim_free_ref(claim); | |
1508 | return ret; | |
1509 | } | |
9bf8e4d4 | 1510 | |
08adf151 | 1511 | int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) |
9bf8e4d4 SW |
1512 | { |
1513 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1514 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
1515 | struct hashtable_t *hash = bat_priv->claim_hash; | |
1516 | struct claim *claim; | |
1517 | struct hard_iface *primary_if; | |
1518 | struct hlist_node *node; | |
1519 | struct hlist_head *head; | |
1520 | uint32_t i; | |
1521 | bool is_own; | |
1522 | int ret = 0; | |
1523 | ||
1524 | primary_if = primary_if_get_selected(bat_priv); | |
1525 | if (!primary_if) { | |
1526 | ret = seq_printf(seq, | |
1527 | "BATMAN mesh %s disabled - please specify interfaces to enable it\n", | |
1528 | net_dev->name); | |
1529 | goto out; | |
1530 | } | |
1531 | ||
1532 | if (primary_if->if_status != IF_ACTIVE) { | |
1533 | ret = seq_printf(seq, | |
1534 | "BATMAN mesh %s disabled - primary interface not active\n", | |
1535 | net_dev->name); | |
1536 | goto out; | |
1537 | } | |
1538 | ||
38ef3d1d SW |
1539 | seq_printf(seq, |
1540 | "Claims announced for the mesh %s (orig %pM, group id %04x)\n", | |
1541 | net_dev->name, primary_if->net_dev->dev_addr, | |
1542 | ntohs(bat_priv->claim_dest.group)); | |
9bf8e4d4 SW |
1543 | seq_printf(seq, " %-17s %-5s %-17s [o] (%-4s)\n", |
1544 | "Client", "VID", "Originator", "CRC"); | |
1545 | for (i = 0; i < hash->size; i++) { | |
1546 | head = &hash->table[i]; | |
1547 | ||
1548 | rcu_read_lock(); | |
1549 | hlist_for_each_entry_rcu(claim, node, head, hash_entry) { | |
1550 | is_own = compare_eth(claim->backbone_gw->orig, | |
1551 | primary_if->net_dev->dev_addr); | |
1552 | seq_printf(seq, " * %pM on % 5d by %pM [%c] (%04x)\n", | |
1553 | claim->addr, claim->vid, | |
1554 | claim->backbone_gw->orig, | |
1555 | (is_own ? 'x' : ' '), | |
1556 | claim->backbone_gw->crc); | |
1557 | } | |
1558 | rcu_read_unlock(); | |
1559 | } | |
1560 | out: | |
1561 | if (primary_if) | |
1562 | hardif_free_ref(primary_if); | |
1563 | return ret; | |
1564 | } |